/*
 * Copyright (c) 2007-2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: LocaleUtility.java,v 1.2.4.1 2005/09/15 08:15:47 suresh_emailid Exp $
 */

package com.sun.org.apache.xml.internal.utils;

import java.util.Locale;

/**
 * @author Igor Hersht, igorh@ca.ibm.com
 */
public class LocaleUtility {
    /**
     * IETF RFC 1766 tag separator
     */
    public final static char IETF_SEPARATOR = '-';
    public final static String EMPTY_STRING = "";

    public static Locale langToLocale(String lang) {
        if ((lang == null) || lang.equals(EMPTY_STRING)) { // not specified => getDefault
            return Locale.getDefault();
        }
        String language = EMPTY_STRING;
        String country = EMPTY_STRING;
        String variant = EMPTY_STRING;

        int i1 = lang.indexOf(IETF_SEPARATOR);
        if (i1 < 0) {
            language = lang;
        } else {
            language = lang.substring(0, i1);
            ++i1;
            int i2 = lang.indexOf(IETF_SEPARATOR, i1);
            if (i2 < 0) {
                country = lang.substring(i1);
            } else {
                country = lang.substring(i1, i2);
                variant = lang.substring(i2 + 1);
            }
        }

        if (language.length() == 2) {
            language = language.toLowerCase();
        } else {
            language = EMPTY_STRING;
        }

        if (country.length() == 2) {
            country = country.toUpperCase();
        } else {
            country = EMPTY_STRING;
        }

        if ((variant.length() > 0) && ((language.length() == 2) || (country.length() == 2))) {
            variant = variant.toUpperCase();
        } else {
            variant = EMPTY_STRING;
        }

        return new Locale(language, country, variant);
    }

}
